Specifications

I Alarms
User PLC Alarms (U)
I - 57
U10 Illegal PLC 0x800x Number of PLC program steps
Details
Software exception
An abnormal stop occurred in PLC program process due to a bus error, etc.
bit0: BIN command operation error
bit1: BCD command operation error
(Note) The number of PLC program steps displayed on the screen may not match the actual
number of error occurrence steps because of the PLC program timing. Use this as a
guideline of the occurrence place.
Remedy
Refer to the methods for using the BCD and BIN function commands.
Details
Software exception
An abnormal stop occurred in PLC program process due to a bus error, etc.
bit6: CALL/CALLS/RET command error
bit7: IRET command execution error
(Note 1) The number of PLC program steps displayed on the screen may not match the actual
number of error occurrence steps because of the PLC program timing. Use this as a
guideline of the occurrence place.
(Note 2) Emergency stop (EMG) is applied for bit6/7.
Remedy
Turn the power ON again.
If the error is not reset, download the correct PLC program.
U50 PLC stopped
Details
The PLC program is stopped.
(Note) The number of PLC program steps displayed on the screen may not match the actual
number of error occurrence steps because of the PLC program timing. Use this as a
guideline of the occurrence place.
Remedy
Start the PLC program.
U55 PLC stopped / is not saved
Details
The PLC program is stopped and not written into ROM.
(Note) The number of PLC program steps displayed on the screen may not match the actual
number of error occurrence steps because of the PLC program timing. Use this as a
guideline of the occurrence place.
Remedy
Write the PLC program into ROM.
U60 Ladder is not saved
Details
The PLC program is not written into ROM.
(Note) The number of PLC program steps displayed on the screen may not match the actual
number of error occurrence steps because of the PLC program timing. Use this as a
guideline of the occurrence place.
Remedy
Write the PLC program into ROM.